Study of a Halpern-type 4[pi] Neutron Detector

Study of a Halpern-type 4[pi] Neutron Detector PDF Author: H. M. Gerstenberg
Publisher:
ISBN:
Category : Neutron counters
Languages : en
Pages : 52

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The response to various neutron spectra of a 2-inch diameter BF3 proportional counter in a Halpern-type geometry has been studied as a function of moderator thickness. Neutron sources used were a calibrated RaDBe(a,n) source and a series of photoneutron sources using a number of bremsstrahlung spectra. The reactions used were: 16PO(gamma,n), 31P(gamma,n) and d(gamma,n). For these sources absolute neutron yields were determined either from the residual B+ activity or from the known cross section and the absolute bremsstrahlung intensity. Using these empirical data a final detector with 13 BF3 counters was constructed. Over the spectral range covered by the above sources the measured efficiency for counting neutrons of the final detector was 9.6 percent with an estimated uncertainty of plus or minus 0.5 percent, independent of spectrum. The detector was used to measure the neutron yields from Pb, Au, Ta, Ho, Ag, Cu, Co, Ca, P, Al, O and C for a series of bremsstrahlung energies between 12.0 and 29.0 MeV. These yields were compared with those calculated from previously published neutron yield cross sections. The data indicate that previously reported discrepancies in neutron yield data can probably be traced to the determination of neutron detector efficiencies. (Author).

Study of a Halpern-type 4[pi] Neutron Detector

Study of a Halpern-type 4[pi] Neutron Detector PDF Author: H. M. Gerstenberg
Publisher:
ISBN:
Category : Neutron counters
Languages : en
Pages : 52

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Book Description
The response to various neutron spectra of a 2-inch diameter BF3 proportional counter in a Halpern-type geometry has been studied as a function of moderator thickness. Neutron sources used were a calibrated RaDBe(a,n) source and a series of photoneutron sources using a number of bremsstrahlung spectra. The reactions used were: 16PO(gamma,n), 31P(gamma,n) and d(gamma,n). For these sources absolute neutron yields were determined either from the residual B+ activity or from the known cross section and the absolute bremsstrahlung intensity. Using these empirical data a final detector with 13 BF3 counters was constructed. Over the spectral range covered by the above sources the measured efficiency for counting neutrons of the final detector was 9.6 percent with an estimated uncertainty of plus or minus 0.5 percent, independent of spectrum. The detector was used to measure the neutron yields from Pb, Au, Ta, Ho, Ag, Cu, Co, Ca, P, Al, O and C for a series of bremsstrahlung energies between 12.0 and 29.0 MeV. These yields were compared with those calculated from previously published neutron yield cross sections. The data indicate that previously reported discrepancies in neutron yield data can probably be traced to the determination of neutron detector efficiencies. (Author).

Government-wide Index to Federal Research & Development Reports

Government-wide Index to Federal Research & Development Reports PDF Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1470

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Publications

Publications PDF Author: United States. National Bureau of Standards
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Category : Government publications
Languages : en
Pages : 788

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Publications of the National Bureau of Standards, 1966-1967

Publications of the National Bureau of Standards, 1966-1967 PDF Author: United States. National Bureau of Standards
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Category :
Languages : en
Pages : 228

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Catalog of National Bureau of Standards Publications, 1966-1976

Catalog of National Bureau of Standards Publications, 1966-1976 PDF Author: United States. National Bureau of Standards
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Category : Government publications
Languages : en
Pages : 804

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Catalog of National Bureau of Standards Publications, 1966-1976: pt. 1 Citations and abstracts. v. 2. pt. 1. Key word index (A through L). v. 2. pt. 2. Key word index (M through Z)

Catalog of National Bureau of Standards Publications, 1966-1976: pt. 1 Citations and abstracts. v. 2. pt. 1. Key word index (A through L). v. 2. pt. 2. Key word index (M through Z) PDF Author: United States. National Bureau of Standards. Technical Information and Publications Division
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Category : Government publications
Languages : en
Pages : 804

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NBS Special Publication

NBS Special Publication PDF Author:
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Category : Weights and measures
Languages : en
Pages : 858

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Annual Report of the National Bureau of Standards

Annual Report of the National Bureau of Standards PDF Author: United States. National Bureau of Standards
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Category : Weights and measures
Languages : en
Pages : 1048

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Masters Theses and Doctoral Dissertations in the Pure and Applied Sciences Accepted by Colleges and Universities of the United States

Masters Theses and Doctoral Dissertations in the Pure and Applied Sciences Accepted by Colleges and Universities of the United States PDF Author:
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Category : Chemistry
Languages : en
Pages : 512

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Master's Theses and Doctoral Dissertations in the Pure and Applied Sciences

Master's Theses and Doctoral Dissertations in the Pure and Applied Sciences PDF Author:
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Category : Dissertations, Academic
Languages : en
Pages : 170

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